LAS VEGAS (KSNV MyNews3.com) -- In a rare interview from Kentucky, a twice-convicted con man explains how he lured his victims. Why? So you can recognize the rip-off.

John Conley, a former con artist, has been convicted twice for his roles in various telemarketing investment schemes.

“I basically learned that investors are greedy,” he said. “The whole point of telemarketing is to win over the people with your personality and that personality can be whatever you choose for the day.”

Conley’s most recent scam was a “boiler room” operation where his employees would cold-call consumers and convince them to invest in oil and gas leases.

“You never take no for an answer,” he said. “You just keep pounding and eventually you will hit their greed button.”

“John Conley is not unlike many other con artists I see that they are very pleasant people,” said U.S. Postal Inspector Roberta Bottoms. “They use their personality to befriend the investor. They prey upon seniors who may be spending a lot of time alone and be lonely, so he’ll spend a lot of time on the phone with them to earn their trust and take their money.”

“Those people are lonely, and they won’t hang up,” Conley said. “So you can keep talking on the phone. You keep talking, and they will literally tell how much is in their bank account.”

Postal inspectors say more than 100 investors lost $3.5 million in this oil and gas scam.

“John made them big promises; he was going to make them rich,” Bottoms said. “He said there was a lot of oil and gas, and he knew where it was. He just needed money to drill the wells and get it to market. And that together he and the investors were going to make a lot of money.”

But those promises were lies.

“He would send them statements, but in reality there was no oil or gas sales,” Bottoms said. “I don’t think he ever sold a drop of oil or vapor of gas.

“This is an addiction for him. When he made that sale he got a thrill out of it. The thrill of cheating somebody and knowing he could talk them out of their money was what drove him more than the money.

Conley says he is now sorry for what he did.

“I look back on that time and think it’s just about the most asinine thing I ever did,” he said, “because there was an honest way to do it.”

Postal inspectors say to thoroughly research all investment opportunities and the people associated with them.

If the victims in this case had researched Conley, they would have learned he had been convicted of mail fraud before this scam.

Postal inspectors say Conley confessed to his role in this scam and testified against his co-conspirator. He spent more than two years in prison for his latest scheme.